Roper Fumiture manufactures office furniture and tracks cost data across their process. The following are some of the costs that they incur. Classify these costs as fixed or variable costs, and as product costs or period costs. \begin{tabular}{l|l|l|} \hline Wood used to produce desks & $125 per desk \\ \hline Production labor used to produce desks & $15 per hour \\ \hline Production supervisor salary & $45,000 per year \\ \hline Depreciation on factory equipment & $60,000 per year \\ \hline Selling and administrative expenses & $45,000 per year \\ \hline Rent on corporate office & $44,000 per year \\ \hline Nails, glue, etc required to produce desks & Varies \\ \hline Utilities expenses for production facility & Not Available \\ \hline Sales staff commission & 5% of sales \\ \hline \end{tabular} Fixed Variable Product Period